Biology
Biology, 26.07.2019 18:00, mayamabjishovrvq9

Distinguish between the structure of pyrimidines and purines. explain why adenine bonds only to thymine.

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Biology, 25.06.2019 14:50, Thefiles
1. double-ringed bases are purines exempt from chargaff's rules complementary with each other pyrimidines 2. which of the following is not a characteristic of chargaff’s rule #1? is also termed chargaff's ratio states that t = a and g = c states that dna composition varies among species states that the ratio of adenine to thymine is equal, as is the ratio of guanine to cytosine 3. what type of bonds are formed between complementary bases? triple carbon to carbon bonds hydrogen bonds ionic bonds polar covalent bonds 4. are single-ringed bases. guanines adenines purines pyrimidines
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Biology, 06.07.2019 20:30, yara49
5. a. is double-stranded like dna b. has the same four nitrogen bases as dna c. contains ribose d. contains thymine 6. the pattern of base pairing in dna can be summarized by the rule a. purines always pair with purines b. any purine can pair with pyrimidine c. pyrimidines only pair with pyrimidines d. adenine pairs with thymine, and cytosine pairs with guanine 7. dna a. involves rna polymerase b. occurs at one site c. requires a dna molecule to start the process d. needs several days' time to occur 8. transporting amino acids to ribosomes for assembly into needed proteins is the function a. dna b. mrna c. rrna d. trna 9. transcription a. at ribosomes b. in the cytoplasm of the cell c. in the nucleus of the cell d. as the last step in protein synthesis
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Biology, 23.07.2019 06:10, abbeyeasterwood
The synthesis of nucleotides requires several amino acids. sort each amino acid as a precursor in the synthesis of purines, pyrimidines, both purines and pyrimidines, or neither purines nor pyrimidines. note: if you answer any part of this question incorrectly, a single red x will appear indicating that one or more of the phrases are sorted incorrectly. purines pyrimidines both neithera. leucine b. lysine c. methionine d. glutamine e. glycine f. histidine g. aspartate h. alanine i. tryptophan
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Biology, 15.10.2019 21:30, vanessa5325
Dna is comprised of four different types of nucleotides. each one is made up of a pentose sugar, a phosphate group, and one of four nucleosides. 2. adenine, guanine, cytosine and thymine are nitrogenous bases. 3. adenine and guanine, which have a nine-member double-ring, are called purines. 4. cytosine and thymine, which have a six-member single-ring, are called pyrimidines.
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